diff --git a/__tests__/Conformance-test.js b/__tests__/Conformance-test.js
index f46ebb4..66252c3 100644
--- a/__tests__/Conformance-test.js
+++ b/__tests__/Conformance-test.js
@@ -29,14 +29,17 @@ describe('Testing each extended conformance file', () => {
     const shaclc = fs.readFileSync(path.join(__dirname, 'extended', file)).toString();
     const ttl = fs.readFileSync(path.join(__dirname, 'extended', file.replace('.shaclc', '.ttl'))).toString();
 
-    expect(
-      (new Parser()).parse(shaclc, { extendedSyntax: true })
-    ).toBeRdfIsomorphic(
-      (new N3.Parser()).parse(ttl)
-    )
+    const res = (new Parser()).parse(shaclc, { extendedSyntax: true });
 
-    expect(
-      () => (new Parser()).parse(shaclc)
-    ).toThrowError();
+    expect(res).toBeRdfIsomorphic((new N3.Parser()).parse(ttl))
+    expect(res.prefixes).toEqual({
+      rdf: 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
+      rdfs: 'http://www.w3.org/2000/01/rdf-schema#',
+      sh: 'http://www.w3.org/ns/shacl#',
+      xsd: 'http://www.w3.org/2001/XMLSchema#',
+      ex: 'http://example.org/test#'
+    })
+
+    expect(() => (new Parser()).parse(shaclc)).toThrowError();
   });
 });
diff --git a/lib/index.d.ts b/lib/index.d.ts
index 8111f13..6c327ef 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -4,4 +4,4 @@ export interface ParseOptions {
   extendedSyntax?: boolean;
 }
 
-export declare function parse(str: string, options?: ParseOptions): Quad[];
+export declare function parse(str: string, options?: ParseOptions): Quad[] & { prefixes: Record<string, string> };
diff --git a/lib/index.js b/lib/index.js
index 1ff73bb..8cb2c9a 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -20,6 +20,7 @@ class Parser {
     const arr = []
     this._parser.Parser.onQuad = (quad) => { arr.push(quad) };
     this._parser.parse(str);
+    arr.prefixes = this._parser.Parser.prefixes;
     return arr;
   }
 }